Suction and pressure pump



July 26, 1960 Filed Jan. 14, 1957 A. ROEBIG SUCTION AND PRESSURE PUMP 2 Sheets-Sheet 1 FIG. 5.

INVENTOR Y ADOLF ROEB/G.

ATTORNEY July 1960 A. ROEBIG 2,946,291

SUCTION AND PRESSURE PUMP Filed Jan. 14, 1957 Y 2 Sheets-Sheet 2 INVENTOR ADOLF ROEB/G.

BY Mum ATTORNEY 2,946,291 SUCTION AND PRESSURE PUMP Adolf Roebig, East Orange, N.J., assignor to Roebig- Christ & 'Co., Inc., Jersey City, N.J., a corporation of New Jersey Filed In. 14, 1957, Ser. No. 634,126

1 Claims. or. 103-149 This invention relates to rotary pumps of the type wherein an eccentric'allymounted resilient diaphragm is progressively pressed against and lifted oif'the inner surface of a cylindrical pump housing, the direction of such action extending circumferentially of the housing from the suction inlet to the pressure outlet portions thereof.

In pumps of this category, the diaphragm is generally secured, along its medial section, to a pressure bushing operatively actuated by an eccentric rotor, the lateral portions of the diaphragm on both sides of said medial portion extending beyond said bushing and having the extreme outer ends thereof anchored to the pump housing. The said lateral portions of the diaphragm in such conventional constructions are thus unsupported, so that they tend to streatch, yield and become distorted under the action of the prevailing high fluid pressures Within the housing, resulting in shortened life of the'diaphragm as well as reduction in discharge pressures. It is the primary object of this invention to provide self-adjusting supporting means for said lateral portions of the diaphragm to obviate the aforesaid shortcomingsan objective which I accomplish by the use of a novel arrangement of a plurality of contiguous independently movable supporting rings of progressively varying proportions, said rings being positioned for engagement with the interior surfaces of said unsupported lateral portions, thereby providing the needed support in synchronous coaction with the eccentric movement of the rotor.

Referring to the drawings,

Figure 1 is a front elevational view of a. form of my invention showing two pump chambers with the rotors 180 apart.

Figure 2 is a vertical longitudinal section thereof, the section being taken along line 2- 2 of Figs. 3 and 4A.

Figure 3 is a side View of the pump looking in the direction of arrows 3-3 of Fig. 1.

Figure 4 is a fragmentary section of Fig. 2 taken substantially along line 4-4 thereof.

Figure 4A is a view like Fig. 4, but showing the position of the rotor and associated parts 90 beyond that of Fig. 4.

Figure 5 is a horizontal axial section of a modified form of pressure bushing with attached diaphragm.

Figure 6 is a fragmentary sectional perspective view of the adjustable supporting rings of my invention shown in operative relation to the diaphragm and the eccentrically mounted sleeve of the pump structure, the section being taken substantially along line 66 of Fig. 2.

Figure 7 is a view substantially like Fig. 6, but showing the parts in another operativeposition, the section being taken substantially along line 77 of Fig. 2.

In the drawings, the pump is illustrated as havingthe two adjacent housing members 1 and 2, the annular wall portions of which are joined to the respective side walls 3 and 4--thereof, the latter walls rotatably'supporting the shaft 5. Fixedly mounted on said shaft are the eccentric rotors 6 and 7 in operative rotatable.engagementwith'two separate ball-bearing means generally designated .8 and disposed onopposite sides .of the central :partition wall 9.

assent Patented July 26, 1950 The sleeves 10 and 11 are operatively mounted over the respective bearing means 8 and carry the respective pres, sure bushings 12 and 13.--these being preferably made of plies of fabric bonded togtlter with semi-hard rubber or other suitable material. In the preferred construction i1: lustrate'd, the flexible and resilient diaphragms l4 and 15 are vulcanized to or otherwise secured to the respective bushings 12 and 13 along the major portions of their respective surfaces, only the upper portions of the dia-- phra'gms, as illustrated in Figs. 4 and 4A, being detached from the bushings. In the specific structure shown, the said bushings have therein the respective slotted portions 16 and 17 proportioned to slidably support therein the re,- spective spring member 18 and 19, said springs extending upwardly into operative engagement with the respective anchor bars generally designated 20,'said anchor bars being suitably attached to their respective housings. As clearly shown in Figs. 4 and 4A, the said detached upper portions of diaphragms 14 and 15 have sections thereof clamped between said respective anchor bars 26 and the upper parts of the annular wall portions of the respective housings, said springs 18 and 19 yieldably supporting the overlying sections of the'respe'ctive detached portions of said 'diaphragms adjacent the outlet or high pressure sides of said respective housings. The arrangement is hence such that said detached portions of the diaphragms are disposed between the inlet and outlet sides of the respec tive housings, therebyserving as sealing barriers between said sides.

Figure 5 shows a special method of attaching the diaphragm 14a to the pressure bushing 12a, the latter corn taining a peripheral dove-tailed recessed portion 30 in interlocking engagement with the correspondingly shaped inner annular protrudingportion of the diaphragm.

It will be noted that in both forms illustrated, only the medial sections of the diaphragms are attached to thp respective bushings, there being opposite lateral portions extending beyond said bushings. The outermostedges of the diaphragm said lateral portions are anchored to the opposite outermost portions of said respective housings, the particular construction illustrated in the drawings showing diaphragm '14 clamped'between the outejr edges of the annular wall portion of the housing 1 and the respective side walls 3 and 9, and diaphragm 15 clamped between the outer edges of the annular wall portion of the housing 2 and the respective walls 4 and 9. The said lateral portions thus extend across the spaces between their respective bushings and the opposite walls which define the sides of the respective housings. Ineach of said spaces and in operative engagement with the undersurface of the lateral portion of the correspondingly positioned diaphragm is an ess'embly of the above-mentioned adjustable supporting rings. By referring to Fig. 2 it will be seen that in housing 1 there are two sets or assemblies of said rings on opposite sides of bushing 12, the left set being designated 21 and the right set 22; and similarly, in housing 2 there are two such sets designated 23 and 24 on opposite sides of bushing 13.

In each of said supporting-ring assemblies there are a plurality of these adjacent rings with flat lateral sides, the respective inside and outside diameters of the ring components of each set increasing progressively out wardly, as clearly seen in Figs. 2, 6 and 7. In each set, the outside diameter of the outer or largest ring is substantially equal to the inside diameter of the diaphragm in the region of its attachment tothe saidsid'e walls; and the inside diameter of the inner or smallest ring is ,substantially equal tothe outside diameter of the sleeve (such as sleeves 10 and 11), the outside diameter of'the smallest ring being equal to that of the outer annular surface of the bushing. The increments of the respective inside and outside diameters of successive 'rings are prefe'r'al ily equal, so as to provide equal supporting pressures-along the entire width of said lateral portions, as will more clearly appear from the description of the operation of my invention as given hereinbelow. ,The rings of each set are in planes normal to the axis of shaft 5, adjacent rings being in slidable engagement with each other and movable in their said normal planes.

' The housing .1 contains the inlet 27 and outlet 25, and the housing 2 contains the correspondingly positioned inlet 28 and outlet 26. Said inlets and outlets are in communication with the interior of the respective-hour ings. Tie rod fasteners 29 hold said walls 3 and 4 in assembled relation. Said housings may be made of any suitable material; and when the device is to be used with corrosive fluids, the housing members or the inner walls thereof may be made of rubber, synthetics or plastic compounds which withstand corrosive action.

In the operation of the pump of my invention, the operative rotation of shaft 5 and the eccentric rotors 6 and 7 causes the progressive actuation of the sleeves 10 and 11 and their respective pressure bushings 12 and 13 in the. circumferential direction of the inner cylindrical surfaces of said respective housings, the lifting action imparted to said respective bushings occurring through an operative radial distance equal to the throw of the eccen tric. Because of the attachment of the said diaphragms 14 and 15 tosaid respective bushings 12 and 13 and to side walls joined to said annular portion, an inlet and an outlet in said housing, a pressure bushing eccentrically mounted within said housing and being laterally spaced from at least one of said side walls, a flexible and resilient diaphragm having a portion thereof attached to the an nular wall of said bushing and another portion attached to said annular wall portion 'of said housing, a lateral portion of said diaphragm extending laterally beyond said bushing and being'circumferentially attachedto' the housin'gin the region' of the juncture of its said 'annularwall portion and the adjacent one of said side walls, eccentric means rotatably mounted within said housing, said bushing being operatively connected to said eccentric means and being operable upon said diaphragm'whereby upon the operative rotation of said eccentric means said bushing progressively presses the diaphragm against said cylindrical surface in a direction from said inlet to said outlet, and adjustable supporting means comprising a plurality of independent adjacent rings mounted for movernent in a direction normal to the axis of rotation of said eccentric means and in underlying supporting engagement with said lateral portion of the diaphragm, said rings having their respective outside peripheries in operative engagement with said lateral portion of the diasaid housings 1 and 2, as aforesaid, the diaphragms will be progressively pressed by their respective bushings along successive portions of the inner cylindrical surfaces of said housings, and'then progressively separated therefrom. This action iswell known to those skilled in the art and therefore requires no explanation in any greater detail. Sufiice it to say, for the purpose of this specification, that wherein the action above described the rotor turns in clockwise direction as indicated in Fig. 4, the fluid is drawn in through said inlets 27 and 28, and

phragm, the diameters of said rings at their respective outside peripheries increasing progressively in the direction away from said bushing.

2. In a pump, a housing comprising an annular wall portion with an inner cylindrical surface and opposite side walls joined to said annular portion, an inlet and an outlet in said housing, a pressure bushing eccentrically mounted within said housing and being laterally spaced from at least one of said side walls, a flexible and reforced out through outlets 25 and 26 by the impelling action of the diaphragms and their respective actuating members.

During each pumping cycle as above described, the rings in each set automatically move relative to each other and are in constant supporting engagement with the lateral portions of the diaphragms which extend be yond their respective bushings. For example, referring to housing 2 as shown in Fig. 2, the outside peripheral portions of the rings of sets 23 and 24 are in engageinent with the bottom extended lateral portions of the diaphragm 15 (see also Fig. 7), so that the action of the fluid pressure within the space between the diaphragm and the housing will be resisted by the rings. As the eccentric rotor continues along its operative path, the'bushing 13 will, after 180, assume a position like that of bushing 12 in housing 1. In this position, the diaphragm has assumed a generally flat configuration, and the rings have shifted their positions, so that they are still in pressing engagement with the diaphragm. This ring-shifting action takes place progressively for each set of rings, so that there is automatic synchronized onaction between the outside peripheries of the rings and the adjacent inside surface of the lateral portions of the corresponding diaphragms.

' Due to this progressive supporting action of the rings, no portions of the diaphragms subject to high pressures areunsupported. They are therefore not subject to the undesirable distorting effects which occur in conventional constructions. Moreover, with the extended lateral portions of the diaphragm held by said rings against inward deflection, maximum discharge pressures are obtainable with my invention. And it is noteworthy that this result is obtained without the use of complicated mechanical adjusting mechanisms.

i What is claimed is.

' 1. In a pump, a housing comprising an annular wall portion with an inner cylindrical surface and opposite silient diaphragm having a portion thereof attached to the annular wall of said bushing'and another portion attached to said annular wall portion of said housing, a lateral portion of said diaphragm extending laterally be yond said bushing and being circumferentially attached to the housing in the region of the juncture of its said annular wall portion and the adjacent one of said side walls, eccentric means rotatably mounted within said housing, said bushing being opcratively connected to said eccentric means and being operable upon said diaphragm whereby upon the operative rotation of said eccentric means said bushing progressively presses the diaphragm against said cylindrical surface in a direction from said inlet to said outlet, and adjustable supporting means comprising a plurality of independent adjacent rings mounted for movement in a direction normal to the axis of rotation of said eccentric means and in underlying supporting engagement with said lateral portion of the diaphragm, said rings having flat lateral sides, adjacent sides of said rings being in slidable engagement.

3. In a pump, a housing comprising an annular wall portion with an inner cylindrical surface and opposite side walls joined to said annular portion, an inlet and an outlet in said housing, a pressure bushing eccentrically mounted Within said housing and being laterally spaced from at least one of said side walls, a flexible and resilient diaphragm having a portion thereof attached to the'annular wall of said bushing and another portion attached to said annular wall portion of said housing, a lateral portion of said diaphragm extending laterally beyond said bushing and being circumferentially attached to the housing in the region of the juncture of its said annular-wall portion and the adjacent one of said side walls, eccentric means rotatably mounted within said housing, said bushing being operatively connected to said eccentric means and being operable upon said diaphragm whereby upon the operative rotation of said eccentric means said bushing progressively presses the diaphragm against said cylindrical surface in a direction from said inlet to said outlet, and adjustable supporting means comprising a plurality of independent adjacent rings mounted for movement in a direction normal to the axis of rotation of said eccentric means and in underlying supporting engagement with said lateral portion of the diaphragm, said rings having flat lateral sides, adjacent sides of said rings being in slidable engagement, said rings having their respective outside peripheries in operative engagement with said lateral portion of the diaphragm, the diameters of said rings at their respective outside peripheries increasing progressively in the direction away from said bushing.

4. In a pump, a housing comprising an annular wall portion with an inner cylindrical surface and opposite side walls joined to said annular portion, an inlet and an outlet in said housing, a pressure bushing eccentrically mounted within said housing and being laterally spaced from at least one of said side walls, a flexible and resilient diaphragm having a portion thereof attached to the annular wall of said bushing and another portion attached to said annular wall portion of said housing, a lateral portion of said diaphragm extending laterally beyond said bushing and being circumferentially attached to the housing in the region of the juncture of its said annular wall portion and the adjacent one of said side walls, eccentric means rotatably mounted within said housing, a sleeve between said eccentric means and said bushing and extending between said side walls, said bushing and sleeve being coactively connected to said eccentric means whereby upon the operative rotation of said eccentric means the bushing progressively presses the diaphragm against said cylindrical surface in a direction from said inlet to said outlet, and adjustable supporting means comprising a plurality of independent rings mounted over said sleeve and disposed between a side of said bushing and the adjacent side wall, said rings having their respective outside peripheries in operative engagement with said lateral portion of the diaphragm, the outside and inside diameters of said respective rings increasing progressively in the direction away from said bushing, said rings being mounted for movement in a direction normal to the axis of rotation of said eccentric means.

5. In a pump, the combination according to claim 4, the innermost one of said rings being in engagement with the adjacent side of said bushing, the outside diameter of said innermost ring being substantially equal to the outside diameter of said bushing and the inside diameter of said innermost ring being substanially equal to the outside diameter of said sleeve, the outermost one of said rings being in engagement with the adjacent side Wall of the housing, the outside periphery of said outermost ring being proportioned for engagement with said lateral portion of the diaphragm substantially along its said circumferential region of attachment to the housing.

6. In a pump, a housing comprising an annular wall portion with an inner cylindrical surface and opposite side walls joined to said annular portion, an inlet and an outlet in said housing, a pressure bushing eccentrically mounted within said housing and being laterally spaced from said side walls, a flexible and resilient diaphragm having a portion of its medial section attached to the annular wall of said bushing and another portion attached to said annular wall portion of said housing, said diaphragm having opposite lateral portions extending laterally beyond said bushing and being circumferentially attached to the housing in the regions of the respective junctures of said annular wall portion and said side walls, eccentric means rotatably mounted within said housing, a sleeve between said eccentric means and said bushing and extending between said side walls, said bushing and sleeve being coactively connected to said eccentric means whereby upon the operative rotation of said eccentric means the bushing progressively presses the diaphragm against said cylindrical surface in a direction from said inlet to said outlet, and two oppositely positioned supporting means for said lateral portions of the diaphragm, each of said supporting means comprising a plurality of independent rings mounted over said sleeve and disposed between the respective opposite sides of said bushing and the correspondingly positioned side walls of thehousing, said rings having their respective outside peripheries in operative engagement with the respective lateral portions of the diaphragm, the outside and inside dimeters of said respective rings increasing progressively in the direction away from said bushing, said rings being mounted for movement in a direction normal to the axis of rotation of said eccentric means.

7. In a pump of the class having a housing with an inner cylindrical Wall and opposite side Walls flanking said cylindrical wall, an inlet and an outlet in said housing, an eccentrically mounted pressure bushing Within said housing and being laterally spaced from at least one of said side walls, and a flexible and resilient diaphragm attached to the bushing and having a lateral portion extending laterally beyond the bushing and attached to the housing at the side thereof where the bushing is spaced from one of said side walls, and wherein the bushing is operative upon the diaphragm to progressively press it against said cylindrical wall in a direction from said inlet to said outlet, the combination of a plurality of independent adjacent rings movable in a direction normal to the axis of rotation of said bushing and in underlying supporting engagement with said lateral portion of the diaphragm, and mounting means for said rings, said latter means extending laterally in an axial direction from the side of said bushing adjacent said rings and through said rings.

References Cited in the file of this patent UNITED STATES PATENTS 

